diff --git a/data/common/common.yaml b/data/common/common.yaml
--- a/data/common/common.yaml
+++ b/data/common/common.yaml
@@ -2532,6 +2532,11 @@
       - swh.loader.mercurial.tasks.LoadMercurial
       - swh.loader.mercurial.tasks.LoadArchiveMercurial
 
+swh::deploy::worker::opam::root_directory: /tmp/opam/
+swh::deploy::worker::opam::instances:
+  opam: https://opam.ocaml.org
+  ocamlbench-repo: https://github.com/OCamlPro/ocamlbench-repo.git
+
 swh::deploy::worker::loader_opam::config_file: "%{hiera('swh::conf_directory')}/loader_opam.yml"
 swh::deploy::worker::loader_opam::concurrency: 1
 swh::deploy::worker::loader_opam::private_tmp: true
diff --git a/site-modules/profile/manifests/swh/deploy/worker/loader_opam.pp b/site-modules/profile/manifests/swh/deploy/worker/loader_opam.pp
--- a/site-modules/profile/manifests/swh/deploy/worker/loader_opam.pp
+++ b/site-modules/profile/manifests/swh/deploy/worker/loader_opam.pp
@@ -17,4 +17,55 @@
       Package[$packages],
     ],
   }
+
+  $opam_instances = lookup('swh::deploy::worker::opam::instances')
+
+  $opam_root = lookup('swh::deploy::worker::opam::root_directory')
+  file {$opam_root:
+    ensure => 'directory',
+    owner  => $user,
+    group  => $group,
+    recurse => true,
+    mode   => '0644',
+  }
+
+  $binary_cmd = "/usr/bin/opam"
+
+  each ( $opam_instances ) | $instance, $instance_url | {
+    $opam_manage_shared_state = "opam-manage-shared-state"
+    $opam_manage_service_name = "${$opam_manage_shared_state}-${instance}"
+    $opam_manage_shared_state_timer_name = "${opam_manage_service_name}.timer"
+
+    # update the instance repository if present
+    $update_command = "${binary_cmd} repo --all --root ${opam_root} | grep ${instance_url} && ${binary_cmd} update --root ${opam_root}"
+    # common suffix command for the opam commands
+    $command_suffix = "--root ${opam_root} ${instance} ${instance_url}"
+    if $instance == "opam" {
+      # Install the default rootdir for the main opam instance
+      $install_command = "${binary_cmd} init --reinit --bare --no-setup ${command_suffix}"
+    } else {
+      # Other instances will just be added to the main opam root directory
+      $install_command = "${binary_cmd} repository add ${command_suffix}"
+    }
+
+    # Either update the instance if present or install/add that new instance
+    $opam_command = "( ${update_command} ) || ${install_command}"
+
+    # Template uses variables
+    #  - $user
+    #  - $group
+    #  - $opam_root
+    #  - $opam_manage_service_name
+    #  - $command
+    ::systemd::timer { $opam_manage_shared_state_timer_name:
+      timer_content    => template("profile/swh/deploy/loader_opam/${opam_manage_shared_state}.timer.erb"),
+      service_content  => template("profile/swh/deploy/loader_opam/${opam_manage_shared_state}.service.erb"),
+      enable           => true,
+      require          => [
+        Package[$packages],
+        File[$opam_root],
+      ],
+    }
+  }
+
 }
diff --git a/site-modules/profile/templates/swh/deploy/loader_opam/opam-manage-shared-state.service.erb b/site-modules/profile/templates/swh/deploy/loader_opam/opam-manage-shared-state.service.erb
new file mode 100644
--- /dev/null
+++ b/site-modules/profile/templates/swh/deploy/loader_opam/opam-manage-shared-state.service.erb
@@ -0,0 +1,17 @@
+# Opam manage shared state unit file
+# Managed by puppet class profile::swh::deploy::worker::loader_opam
+# Changes will be overwritten
+
+[Unit]
+Description=Software Heritage Manage OPAM shared state (<%= @instance %>)
+Requires=network.target
+After=network.target
+
+[Service]
+User=<%= @user %>
+Group=<%= @group %>
+Type=simple
+ExecStart=<%= @opam_command %>
+
+[Install]
+WantedBy=multi-user.target
diff --git a/site-modules/profile/templates/swh/deploy/loader_opam/opam-manage-shared-state.timer.erb b/site-modules/profile/templates/swh/deploy/loader_opam/opam-manage-shared-state.timer.erb
new file mode 100644
--- /dev/null
+++ b/site-modules/profile/templates/swh/deploy/loader_opam/opam-manage-shared-state.timer.erb
@@ -0,0 +1,11 @@
+[Install]
+WantedBy=timers.target
+
+[Timer]
+OnCalendar=daily
+AccuracySec=4h
+Persistent=true
+Unit=<%= @opam_manage_service_name %>.service
+
+[Unit]
+Description=Software Heritage Manage OPAM shared state (<%= @instance %>) timer